2) A third runway to the south west of the airport which starts over Wraysbury and King George VI reservoirs. A section of the M25 would need to be reconfigured and tunnelled and the village of Stanwell Moor flattened.

3) A third runway close to Sipson, Harlington and Cranford Cross. It would be a shorter length with fewer planes, the cheapest and quickest option but also the noisiest and the highest number of homes would be affected.